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Abomey, the historic soul of Benin, sits nestled within the Zou department on a gently undulating plateau in the southern interior. Its urban character is a blend of royal heritage and growing administrative centrality, characterized by a low-density sprawl that gradually transitions into a fertile agricultural hinterland. Positioned away from the humid coastal belt of Cotonou, Abomey experiences a more continental influence, where the terrain is predominantly flat with minimal topographic barriers to obstruct airflow. This openness makes the city particularly susceptible to long-range transport of atmospheric pollutants. The surrounding landscape is a mosaic of savanna grasslands and small-scale farming plots, where the burning of crop residues is a common practice. While the city lacks a concentrated heavy industrial belt, the urban–rural gradient is marked by a reliance on biomass for energy, contributing to localized particulate matter. The nearest significant water bodies are small seasonal streams and regional rivers, which provide minimal cooling effects compared to the coast, leading to higher daytime surface temperatures. These thermal conditions often create localized convective currents that can trap pollutants near the ground during the early morning hours. The city's elevation is modest, yet its inland position ensures that it remains a focal point for the Harmattan’s dusty reaches. Consequently, the air quality is dictated less by industrial emissions and more by the interplay between natural dust cycles, agricultural combustion, and the steady increase in motorized traffic across its historic streets.

In Abomey, air quality is governed by the rhythmic oscillation between the wet and dry seasons. The dry season, spanning from November to March, represents the period of highest pollution risk, primarily driven by the Harmattan. This northeasterly trade wind carries vast quantities of mineral dust from the Sahara Desert, significantly elevating particulate matter concentrations. During these months, particularly in January and February, the atmosphere often becomes hazy, and temperature inversions can trap smoke from domestic charcoal fires and agricultural burning close to the surface. This makes the dry season the most challenging time for respiratory health, and sensitive groups, including children and the elderly, are advised to limit prolonged outdoor exertion during peak dust events. Conversely, the wet season, from April to October, brings a dramatic improvement in air clarity. Frequent monsoon rains act as a natural scrubbing mechanism, washing particulates from the sky through wet deposition. Humidity rises, and the cooling effect of the rains suppresses the lifting of dust. October often sees a transitional dip in quality as the first dry winds return. For those seeking the cleanest air, the peak rainy months of June and July are ideal. Health guidance for Abomey emphasizes the use of protective masks during the Harmattan peak and ensuring proper ventilation in homes during the agricultural burning windows. By monitoring wind patterns and seasonal shifts, residents can better navigate the atmospheric challenges inherent to this tropical interior climate zone.